<!DOCTYPE html> <html> <body> <h1>JavaScript 运算符</h1> <h2>?. 运算符</h2> <p>如果对象为 undefined 或 null,则 ?. 运算符返回 undefined(而不是抛出错误)。</p> <p>汽车品牌是:</p> <p id="demo"></p> <script> const car = {type:"Fiat", model:"500", color:"white"}; let name = car?.name; document.getElementById("demo").innerHTML = name; </script> </body> </html>